A versatile strategy for appending a single functional group to a multifunctional host through host-guest...

Area of Science:

• Supramolecular Chemistry
• Organic Synthesis
• Materials Science

Background:

• Selective mono-functionalization of molecular hosts is crucial for developing advanced supramolecular systems like probes and catalysts.
• The presence of multiple identical reactive groups on hosts poses a significant challenge to achieving selective mono-functionalization.

Purpose of the Study:

• To introduce a general and efficient two-step strategy for the selective mono-functionalization of molecular hosts.
• To demonstrate the versatility of this strategy using a calix[6]arene scaffold.

Main Methods:

• A two-step strategy involving host-guest complexation and covalent capture.
• Utilizing orthogonal functional groups on a guest molecule and complementary reactive sites on the host.
• Employing Huisgen thermal azide-alkyne cycloaddition for the initial covalent capture step.

Main Results:

• Successfully achieved selective mono-functionalization of a calix[6]arene scaffold with three reactive units.
• Demonstrated post-functionalization by grafting a redox tag, fluorescent probe, and polydentate ligand.
• Confirmed the strategy's effectiveness through esterification, Schiff base formation, and nucleophilic substitution.

Conclusions:

• The proposed two-step strategy provides a general and reliable method for selective mono-functionalization of molecular hosts.
• This approach enables the controlled introduction of diverse functionalities onto supramolecular scaffolds.
• The method opens avenues for creating sophisticated supramolecular architectures for various applications.